Grandma lives in a cute, blue house.

Put a comma between two adjectives that describe the same noun. If you can put "and" between the two adjectives without changing the meaning, you should put a comma there.

Adjectives are words that describe nouns.

Nouns are words that name persons, places, things, and ideas.

Punctuation marks are the road signs of writing. They tell us when to pause, slow down, or stop. They help us group words together, ask questions, and express emotions. That's why punctuation marks are so important. Here's a good punctuation rule for you to know.